Study on the hot deformation behavior of Al-Zn-Mg-Cu-Cr aluminum alloy during multi-stage hot compression  

作　　者：Gaoyong LIN Xiaoyan ZHENG Wei YANG Di FENG Dashu PENG 

机构地区：[1]School of Materials Science and Engineering, Central South UniverSity, Changsha 410083, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2009年第2期110-116,共7页金属学报（英文版）

基　　金：supported by the National Key Basic Research and Development Program of China(No.G1999064908)

摘　　要：The mechanical behavior and microstructures of an Al-Zn-Mg-Cu-Cr aluminum alloy during multi-stage hot deformation were investigated by thermal stimulation test, optical microscopy, and transmission electron microscopy. The true stress vs true strain curves and the microstructure evolution of two hot deformation procedures were gained. The flow stress of the alloy studied decreases with increasing the deforming passes and declining the temperature, and the larger the temperature decline between adjacent stages, the larger the peak stress fall is. The stress-strain behavior mainly result from the dynamic recovery during deformation, the static recovery and recrystallization in the delay time, and the second phases precipitated from the matrix at high temperature.The mechanical behavior and microstructures of an Al-Zn-Mg-Cu-Cr aluminum alloy during multi-stage hot deformation were investigated by thermal stimulation test, optical microscopy, and transmission electron microscopy. The true stress vs true strain curves and the microstructure evolution of two hot deformation procedures were gained. The flow stress of the alloy studied decreases with increasing the deforming passes and declining the temperature, and the larger the temperature decline between adjacent stages, the larger the peak stress fall is. The stress-strain behavior mainly result from the dynamic recovery during deformation, the static recovery and recrystallization in the delay time, and the second phases precipitated from the matrix at high temperature.

关 键 词：Al-Zn-Mg-Cu-Cr alloy Multi-stage compression Flow stress and peak stress Micro-structure evolution 

分 类 号：TG144[一般工业技术—材料科学与工程] TG502.15[金属学及工艺—金属材料]